IARU Amateur Satellite Frequency Coordination

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14-BISat Updated: 29 Aug 2014   Responsible Operator Cedric Cordeiro PU1SLF
Supporting Organisation QB50 & Instituto Federal Fluminense  
Contact Person salotto@uol.com.br.nospam  
Headline Details: A 2U spacecraft. 14-BISat will host one of the QB50 science package to study the lower thermosphere. Apart from this cooperation with the QB50 scientific goals, 14-BISat will have two technological objectives: 1. GAMANET: GAMANET is an ambitious endeavour in space communications. Its challenge is the creation of the largest ad hoc communications network ever in Space. Its goal is to bring the networking capability to satellite constellations. As GAMANET participants, CubeSat Teams will have the networking resources required to send commands from Ground and to receive satellite telemetry, even when their own satellites are not within range of their Stations. Joining CubeSats and Ground Stations in a seamless communications network, the GAMANET initiative aims to 1) validate innovative communication technologies in space and 2) improve the overall QB50 communications and scientific results. GAMANET’s enabling device is GAMALINK, an advanced communications platform relying on the flexibility of Software-Defined Radio. Present on every GAMANET node, whether a CubeSat or a Ground Station, GAMALINK empowers the formation of mobile wireless ad hoc networks in space. GAMALINK also delivers accurate position determination based on GPS, which provides absolute position and timing information that may be used to achieve synchronisation between satellites. 2. Radio-based attitude determination: 14-BISat participates in a novel attitude determination experiment based on radio waves. Radio signals in the S-band region of the spectrum will be sent from three patch antennas on each face of the CubeSat, allowing the receiver(s), either ground stations or other GAMALINK enabled satellites, to measure the carrier phase difference between antennas. These differences are geometrically related to the relative attitude of the satellite to the observer. Between these antennas and the driving RF front-end there will be antenna switch electronics, allowing one RF front-end in the GAMALINK board to synchronously switch between antennas and generate the required attitude dependent signals in space. Besides coding to avoid interference with other radio sources, the signals transmitted will carry basic telemetry of 14-BISat. The bandwidth of these signals will fit 15 KHz, enabling reception at a ground station to be achieved through conventional equipment (an S-band dish antenna on a rotator, a radio receiver and a computer with an audio card). This will enable this mode of operation to act as a beacon, which can be received by amateur radio stations across the globe Proposing a 9k6 UHF FSK downlink with a S Band spread spectrum 1Mbps CDMA GAMANET transceiver. **Downlinks on 437.475MHz and between 2405 - 2445MHz have been coordinated**
Application Date: 17 Oct 2013   Freq coordination completed on 18 Aug 2014

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